Henry goebel



(No Model.)

H. GOEBEL.

V'AGU'UM PUMP. No. 252,658. Patented Jan. 24,1882.

WITNESSES ATTORNEY UNrren S ATES PATENT Orrr'ee.

HENRY GOEBEL, on NEW YORK, N. v.

VACUUM-PUMP.

SPECIFICATION forming part of Letters Patent No. 252,658, dated January24,1882. Application filed August 5, 1881. (No model.)

To all whom it may concern:

Beit known that I, HENRY GOEBEL, of the city, county, and State of NewYork, have invented certain new and useful Improvements in Vacuum-Pumps,of which the following is a specification.

This invention has reference to an improved vacuum-pump based on thewell-known Geissler system of vacuum-pumps, but adapted to render theoperation of the same mechanical, so that unskilled hands may operatethe pump and evacuate electric lamps and other vessels in a rapid andreliable manner; and the invention consists of a Geissler pump providedwith an air-discharge valve at its upper end, the

' whole pump being supported on a pivoted frame, which is oscillated bymeans of a handlcver, so as to throw a body of mercury into atrough-shaped horizontal portion of the evacuating-tube and form thereina mercurial seal. The mercury -receptacle connected with the pump isadapted to be raised to the proper height by a suitable hoistingmechanism until the surplus mercury passes through the discharge-valveat the top of the pump and back again by a connecting-tube to theverticallyguided mercury-reoeptacle. Upon the lowering of themercury-receptaele the pump is returned into normal position and readyfor evao uation.

The accompanying drawing represents a front ele 'ation of my improvedvacuum-pump.

A in the drawing represents a vertical support or stand, to which ispivoted the supporting-frame B of a Geissler vacuum-pump, G.

To the lower part of the pivoted frame B is applied a connecting-rod, a,and hand-lever b, by which the frame B may be oscillated to a certainextent, as required by the pump.

The upper part of the Geissler pump 0 is provided with anupwardly-opening dischargevalve, d, and above the same with a eylindrical tube, (1, which is open at the top and provided above the valve dwith a short downwardly-extending tube, (1 that is connected by a rubbertube, 0, with a mercury-reservoir, D, supported in a cage, D. Thereservoir 1) and cage D are raised or lowered in vertical guides D by asuitable hoisting mechanism, E.

The lower end of the Geissler pump 0 is connected in a sim lar manner asthe upper end by a flexible tube, 0, with the lower end of themercury-reservoir D, the tube being of sufficientlength to provide forthe distance required in hoisting the reservoir.

To the upper end of the Geissler pump C, below the valve d, is connectedthe evacuatingtube F by a trough-shaped portion, F, which increases indepth as it approaches the neck of the pump, and which extends nearly atright angles to the main part of the tube F. The connecting portion F ismade widest close to the point of connection with the Geissler pump 0,so that the mercury within the bulb-shaped portion F will be thrown overtoward the angular connection with the main tube F and form there amercury seal, which prevents positively the passage of air to theGeissler pump, while admitting the charging of the same with mercuryfrom the reservoir D preparatory to working the pump.

The charging of the pump is accomplished by raising themercury-reservoir up to and above a level with the upper part of thepump 0 until the mercury passes through the valve (1 andcommunicating-pipe 6 back to the reser= voir. The reservoir is thenlowered and the pump-frameB thrown toward the left. The play of the pumpwill then begin in the usual well-known manner, it evacuating theelectric lamps or other vessels sealed onto the upper end of theevacuating tube F.. The main part of the evacuating-tube F is madesomewhat higher than the barometric height of a column of mercuryexposed to atmospheric pressure, so that the pressure within the pumpmay be readily observed by means of a barometer, B, arranged sidewise ofthe evacuating-tube F on frame A.

I prefer to expose the lamps or vessels before and during evacuation tothe heat of a gasburner, G, arranged at the upper part of the frame A,so as to expel the moisture contained in the air within the lamp-bulbs,which hitherto was allowed to remain in the same.

The main advantage of my improved vacuum-pump is that the pump containsno groundglass stop-cocks of any kind, which are always a, source ofleakage, they forming to some extent t-he weak points ofpumps forproducing high vaeua. Another advantage is that the operation of thepump is entirely mechanical,

and can be attended to by inexperienced hands, which is an importantfeature when large numbers of electric vacuum-lamps have to beevacuated.

Having, thus described my invention, I claim as new and desire to secureby Letters Patent- 1. The combination of a Geissler vacuumpnnip having adischarge-valve at the upper part and an evacuating-tube connectedthereto below the valve with an oscillating supportingframe and avertically-movable mercury-reservoir, substantially as set forth.

2. The combination of a Geissler vacuumpump applied to an oscillatingsupportingframe and having a discharge-valve at the upper end, with amercury-supply reservoir with pipes for connecting the upper and lowerends of the Geissler pump with the supply-reservoir, and with 'means forhoisting the latter, substantially as set forth.

tends at right angles, or nearly so, from the.

main part of the evacuating-tube F, substantially as and for the purposeset forth.

In testimony that I claim the foregoing as my invention I have signed myname, in presence of two witnesses, this 30th day of July, 1881.

HENRY GOEBEL.

Witnesses:

PAUL GoEPEL, OAuL KARP.

